Lock



FIG. 1 is a front left perspective view of the lock, showing my design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a left plan view thereof;

FIG. 5 is a right plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM I claim the ornamental design for a lock, as shown and described. 